http://askubuntu.com –
Something I ran across in the wee hours of the morning this morning was that the software center samba package differs from the samba apt-get package. How do you in a direct way (as in from software center or some other direct method...not pre-install post-install package list diff-ing) determine what package/pseudo-package a software center line item pulls in?
(HowTos)

i had some problem with ubuntu software center so i uninstalled it then reinstalled
using following codes

sudo apt-get install software-center

i was getting the message as follows.......

Package software-center is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'software-cent